Remember:
Feeders used for reception should always be twisted clockwise while
transmission lines must be twisted counterclockwise.
Steve
N4LQ
----- Original Message -----
From: "Michael O. Hyder" <N4NT@charter.net>
To: "Paul Christensen" <paulc@mediaone.net>; "Ten-Tec Reflector"
<tentec@contesting.com>
Sent: Friday, March 31, 2000 7:19 PM
Subject: Re: [TenTec] Re: Ten Tec antenna tuners
>
> I always thought twisting the feedline was to cancel radiation from the
> transmission line. A poem appeared in QST in the late 50's. It went:
>
> Feedline going up the wall,
> Please don't radiate at all;
> For if you do, then by and by,
> I'll be plagued with TVI.
>
> With TV twin-lead to a television set, the feedline is twisted to cancel
> received signals on the feedline and resultant ghost images on the screen.
>
> Mike N4NT@charter.net
>
> ----- Original Message -----
> From: "Paul Christensen" <paulc@mediaone.net>
> To: "Patrick A. Thompson Sr." <patrickth@mindspring.com>;
> <tentec@contesting.com>
> Sent: Friday, March 31, 2000 3:43 PM
> Subject: Re: [TenTec] Re: Ten Tec antenna tuners
>
>
> |
> | >the tuner to the window feedthru plug. Beyond the window feedthru is
14ga
> | >ladderline with a slow twist.
> |
> | What benefit is derived from twisting the feedline? Is it physical or
> | electrical? From the 1920s and '30s issues of QST, I often find
> | descriptions for adding "transposition blocks" on the feedline every few
> | feet. This, in effect, forms a twist on the line as well, except that
the
> | twist is the reverse from the prior twist or transposition. If
> | transpositioning the feeder was so popular then, why don't we see the
> | technique discussed and used today when using balanced line?
> |
> | -Paul, W9AC
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|